Handlebar extension



FIG. 1 is a side perspective view of a handlebar extension showing my new design, the bicycle handlebar being shown in broken lines for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a greatly enlarged side perspective view of the handlebar extension;

FIG. 3 is a left side elevation view of the handlebar extension according to the present design;

FIG. 4 is a bottom plan view of the handlebar extension according to the present design;

FIG. 5 is a front elevation view of the handlebar extension according to the present design;

FIG. 6 is a top plan view of the handlebar extension according to the present design;

FIG. 7 is a right side elevation view of the handlebar extension according to the present design; and,

FIG. 8 is a rear elevation view of the handlebar extension according to the present design.

The broken lines shown herein are for illustrative purposes only and form no part of the claimed design.

FIG. 2 is shown on an enlarged scale with respect to the other views. 

The ornamental design for a handlebar extension, as shown and described. 